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Finding the Fourth Proportional to 103,215.60, 154,823.40 and 87,469.20

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Solution

The fourth proportional to 103,215.60, 154,823.40 and 87,469.20 is: 131,203.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,215.60 : 154,823.40 = 87,469.20 : x
  2. Step 2: Convert to fraction form
    103,215.60/154,823.40 = 87,469.20/x
  3. Step 3: Cross multiply
    103,215.60x = 154,823.40 × 87,469.20
  4. Step 4: Simplify right side
    103,215.60x = 13,542,278,939.28
  5. Step 5: Solve for x
    x = 13,542,278,939.28/103,215.60
  6. Step 6: Final answer
    x = 131,203.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.